A new storm drainage system must be constructed right away to reduce periodic flooding that occurs in a city that is in a valley. Five mutually exclusive designs have been proposed, and the present worth (in thousands of dollars) of costs and benefits are the following. a. Which system has the greatest B-C ratio? b. Which system has the largest incremental B-C ratio (based on differences between alternatives)? c. Which system should be chosen? a. System has the greatest B-C ratio, which is (Round to two decimal places.)